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the release of useful substances in the body.
extremely small infectious particles that can only reproduce inside a host cell.
tumours in the lung tissue that interfere with the normal functioning of the lungs.
the liquid produced by the kidneys consisting mainly of water and nitrogenous wastes such as...
(also called secondary thickening) growth due to new cells being formed by the secondary...
process by which cells become specialised to perform a specific function.